hw/cpu/arm_mpcore: Remove default values for GIC external IRQs

Implicit default values are often hard to figure out, better
be explicit. Now that all boards explicitly set the number of
GIC external IRQs, remove the default values (displaying an
error message if it is out of range).

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20250212154333.28644-9-philmd@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 12 insertions, 6 deletions

diff --git a/hw/cpu/a9mpcore.c b/hw/cpu/a9mpcore.c
index 25416c5032..1b9f2bef93 100644
--- a/hw/cpu/a9mpcore.c
+++ b/hw/cpu/a9mpcore.c
@@ -56,6 +56,11 @@ static void a9mp_priv_realize(DeviceState *dev, Error **errp)
     CPUState *cpu0;
     Object *cpuobj;
 
+    if (s->num_irq < 32 || s->num_irq > 256) {
+        error_setg(errp, "Property 'num-irq' must be between 32 and 256");
+        return;
+    }
+
     cpu0 = qemu_get_cpu(0);
     cpuobj = OBJECT(cpu0);
     if (strcmp(object_get_typename(cpuobj), ARM_CPU_TYPE_NAME("cortex-a9"))) {
@@ -160,13 +165,14 @@ static void a9mp_priv_realize(DeviceState *dev, Error **errp)
 
 static const Property a9mp_priv_properties[] = {
     DEFINE_PROP_UINT32("num-cpu", A9MPPrivState, num_cpu, 1),
-    /* The Cortex-A9MP may have anything from 0 to 224 external interrupt
-     * IRQ lines (with another 32 internal). We default to 64+32, which
-     * is the number provided by the Cortex-A9MP test chip in the
-     * Realview PBX-A9 and Versatile Express A9 development boards.
-     * Other boards may differ and should set this property appropriately.
+    /*
+     * The Cortex-A9MP may have anything from 0 to 224 external interrupt
+     * lines, plus always 32 internal IRQs. This property sets the total
+     * of internal + external, so the valid range is from 32 to 256.
+     * The board model must set this to whatever the configuration
+     * used for the CPU on that board or SoC is.
      */
-    DEFINE_PROP_UINT32("num-irq", A9MPPrivState, num_irq, 96),
+    DEFINE_PROP_UINT32("num-irq", A9MPPrivState, num_irq, 0),
 };
 
 static void a9mp_priv_class_init(ObjectClass *klass, void *data)